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Questions tagged [cpu-frequency]

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21
votes
1answer
24k views

Can't use “userspace” cpufreq governor and set cpu frequency

I'm trying to change the cpu frequency on my laptop (running Linux), and not having any success. Here are some details: # uname -a Linux yoga 3.12.21-gentoo-r1 #4 SMP Thu Jul 10 17:32:31 HKT 2014 ...
5
votes
1answer
20k views

CentOS conservative governor, nice error

I changed my CentOS 6 CPU governor from ondemand (the default one) to conservative and got this after restarting the cpufreq service: /etc/rc5.d/S13cpuspeed: line 88: /sys/devices/system/cpu/...
3
votes
1answer
4k views

how to turbo boost my cpu on Ubuntu?

My PC has one Intel Haswell i5 4690, which is supposed to be boosted up to 3.9GHz from the regular frequency 3.5GHz. I do not know if it is possible to use some softwares to turbo boost this cpu on ...
31
votes
1answer
60k views

Setting CPU governor to on demand or conservative

I'm struggling with cpupower on ArchLinux. I want to set governor to ondemand or even to conservative. First if I do $ sudo cpupower frequency-info --governors, I only get performance powersave. So ...
11
votes
1answer
23k views

Why do cpuinfo_cur_freq and /proc/cpuinfo report different numbers?

When I do sudo watch -n1 cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq I get 1.8 - 2.7 GHz. It never goes above 2.7. And when I do watch -n1 "cat /proc/cpuinfo | grep MHz" I get 768 ...
11
votes
1answer
19k views

How to set up Linux for full AMD APU power management support: Turbo Core, Cool'n'Quiet, Dynamic Power Management?

My objective is to set up a mini server (not HTPC) with low power consumption in idle mode, yet offering nice performance when used. The focus is more on data safety than availability. In other words: ...
7
votes
1answer
5k views

How to set the CPU freq. in Linux?

I'm using this ARM9 SAM9G25 embedded system, that when switched on, is only online for a few seconds and because I want to speed up the whole process, I'd like to check the CPU frequency, and set it ...
5
votes
1answer
5k views

Setting CPU frequency guidelines

I'm changing my CPU frequency because of noisy fan. I used sudo cpufreq-selector -g powersave for this purpose, but I replaced my Linux system Xubuntu with Lubuntu because it utilizes better ...
3
votes
1answer
5k views

How to get ondemand governor on fedora

In Ubuntu 13.10 on my (Dual Core i5 Lenovo G570) laptop, I recently discovered the wonders of indicator-cpufreq, so I can extend my battery life dramatically by setting it to 'ondemand' or 'powersave' ...
2
votes
3answers
5k views

How does CPU frequency work in conky?

I'm setting up conky and I would like to add the CPU frequency, but if I put ${freq_g cpu0} Ghz I get 1.2Ghz. Why is that? My CPU is 2.8Ghz.
1
vote
0answers
209 views

Do Linux cpufreq governers temporarily change sysfs's scaling_max_freq?

The linux documentation of the variable sysfs scaling_max_freq reports Maximum frequency the CPUs belonging to this policy are allowed to be running at (in kHz). This attribute is read-...
3
votes
0answers
305 views

CPU frequency goes back after scaling down by indicator-cpufreq, suspension and waking up

I scale down the CPU frequency by indicator-cpufreq on Ubuntu 12.04. After I suspend Ubuntu and wake it up, the CPU goes back to"on demand" (the default). I wonder if there is a way to keep the CPU ...
2
votes
1answer
2k views

How to set up a Debian system (focus on 2D or console/server) with an AMD Turbo Core APU for maximum energy and computing efficiency?

I plan to set up an AMD APU system using Debian, but I cannot find hints how to achieve maximum energy efficiency and successful use of Turbo Core. In particular, the Debian Wiki HowTo on CPU ...
2
votes
1answer
3k views

Scale cpu frequency in CLI?

I am using cpufreq to scale my CPU frequency. But I do that by clicking cpufreq icon on the panel of Ubuntu 12.04. If without a mouse, how can I show and scale CPU frequency by running commands in ...
1
vote
1answer
2k views

How to disable CPU frequency scaling in CentOS 6?

I have two exactly same bare metal servers with same OS/kernel configuration, but they are running at two different CPU frequencies: the one is fixed at 2300MHz, while the other changes between ...